“She has an abiding love for all things Scandinavian. Go figure,” said one associate who asked not to be named.

The trip had been booked months in advance, one source told us, even before Olague was spotted checking out an Oslo hotel on her computer in the Board of Supervisors chamber during her momentous vote to defy Mayor Ed Lee and reinstate Sheriff Ross Mirkarimi.

Why the trip was hush-hush now is hard to figure. One Olague aide initially would only say that the outgoing supervisor had left the country but would not provide her destination.

Enrique Pearce, a political consultant on Olague’s campaign, said he simply didn’t know where she was. “I don’t know,” he said. “I really don’t.”

Olague did file a notice of absence with the clerk of the board indicating she would be gone from Nov. 5 to Nov. 15, but it didn’t say where she was going. She actually attended the board meeting on election day, Nov. 6.

Olague is scheduled to return Monday. Maybe she just wanted to check out the Oslo opera house. After all, the same architects are designing the Golden State Warriors proposed arena on the San Francisco waterfront. We’re sure that’s it.